Exercise machine



FIG. 1 is a front perspective view of our new design;

FIG. 2 is a rear perspective view of our new design;

FIG. 3 is a top plan view of our new design;

FIG. 4 is a right side elevation view of our new design;

FIG. 5 is a front elevation view of our new design; and,

FIG. 6 is a rear elevation view of our new design.

The left side elevation is a mirror image of the right side elevation view of FIG. 4.

The bottom of the exercise machine is planar and unornamented. 

The ornamental design for an exercise machine, as shown and described. 